cbs: ff_cbs_delete_unit: Replace return value with assert

cbs: ff_cbs_delete_unit: Replace return value with assert

ff_cbs_delete_unit never fails if the index of the unit to delete is
valid, as it is with all current callers of the function. So just assert
in ff_cbs_delete_unit that the index is valid and change the return
value to void in order to remove the callers' checks for whether
ff_cbs_delete_unit failed.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>